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A witness claims a Chester police officer used excessive force against a woman he was trying to arrest and he shared the cell phone video of the arrest with NBC10. Nefertiti Jaquez reports. (Published Thursday, Apr 17, 2014)

Updated at 11:58 PM EST on Thursday, Apr 17, 2014

An attack by a knife-wielding woman on an officer from a Delaware County police department was caught on a cell phone video camera.

It all started last Sunday when a Chester City police officer responded to a 911 call about a woman waving a knife at people at a gas station along 9th Street.

The witness, who asked to remain anonymous, says that although the woman did attempt to hit the officer with the knife, his reaction was unnecessary. He can be seen on the video hitting her several times before Tasing her.

"...Just because he's an officer of the law and he wears a badge, doesn't take away he used excessive force on this female."